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  • Acerbis
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    • Auxiliary & Drop Tanks

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    Push your adventure further without stopping. Auxiliary and drop tanks are purpose-built add-on fuel systems that work alongside your existing factory tank, giving you the extra range to tackle remote trails, multi-day trips, or back-country races where fuel access is limited. Unlike standard replacements, auxiliary tanks are designed to supplement — not replace — your stock setup.

    From quick-detach rally-style drop tanks to low-profile bolt-on units, our selection covers a wide range of dirt bike fitments. These tanks are engineered for durability and ease of use, featuring sealed construction, high-flow filler caps, and direct fuel line connections. Popular for adventure riders, enduro racers, and overland touring enthusiasts who refuse to be limited by factory range.

    Use the fitment selector to find a compatible auxiliary tank for your year, make, and model.

    Frequently Asked Questions

    What are auxiliary and drop gas tanks for dirt bikes?

    Auxiliary and drop tanks are secondary fuel cells designed to increase a motorcycle's fuel capacity without replacing the main OEM tank. Leading brands like IMS and Clarke manufacture these specialized kits to mount to the front forks or rear subframe, providing an extra 1 to 2 gallons of fuel for long-distance trail rides and rallies.

    Which dirt bike models are compatible with IMS and Clarke auxiliary tanks?

    These add-on tanks are specifically engineered for popular off-road models including the Honda CRF450X, Yamaha WR450F, and the KTM 500 EXC. Because these fuel systems are precision-molded to fit around existing frames and cooling systems, buyers should confirm their specific make, model, and year to ensure the brackets and plumbing align correctly.

    How much extra fuel capacity do dirt bike drop tanks provide?

    Most dirt bike auxiliary tanks, such as the IMS Bolt-On series or Acerbis front-mounted tanks, offer an additional 1.1 to 1.5 gallons of gasoline. This extra volume effectively extends your riding range by 30 to 50 miles depending on your engine displacement and riding style, making them a lightweight alternative to a bulky 4-gallon main tank.

    Are aftermarket auxiliary fuel tanks easy to install and plumb?

    Most auxiliary kits from IMS and Clarke include all necessary mounting hardware and fuel lines designed to tap into your bike's existing fuel system via a T-fitting or vacuum pump. These systems are designed for a mechanical 'drop' where the auxiliary fuel is consumed first, maintaining a lower center of gravity as you ride through technical terrain.

    Should I buy an auxiliary tank or an oversized main gas tank?

    Choose an auxiliary drop tank if you want to maintain the slim ergonomics of your original shrouds for short rides while having the option to add capacity for desert racing or dual-sport touring. For riders who always need maximum fuel, combining a large 3.2-gallon main tank with a rear-mounted auxiliary tank is the best way to achieve the highest possible mileage on remote trails.